Employee Benefit Plans (Summary Of The Change In Fair Value For Pension Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value Of Pension Plan Assets	$ 1,281,261	$ 1,105,370
Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value Of Pension Plan Assets	0	0
Defined Benefit Plan, Purchases, Sales, and Settlements	50,000
Actual return on plan assets, Relating to assets still held at the reporting date	149	0
Defined Benefit Plan, Fair Value Of Pension Plan Assets	50,149	0
Real Estate [Member] | Private Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value Of Pension Plan Assets	34,520	29,553
Defined Benefit Plan, Purchases, Sales, and Settlements	0
Actual return on plan assets, Relating to assets still held at the reporting date	2,391	4,967
Defined Benefit Plan, Fair Value Of Pension Plan Assets	36,911	34,520
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value Of Pension Plan Assets	34,520	29,553
Defined Benefit Plan, Purchases, Sales, and Settlements	50,000
Actual return on plan assets, Relating to assets still held at the reporting date	2,540	4,967
Defined Benefit Plan, Fair Value Of Pension Plan Assets	87,060	34,520
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Private Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value Of Pension Plan Assets	$ 36,911	$ 34,520